Ash from waste-to-energy facilities burning municipal solid waste (MSW) is no longer exempt from Subtitle C if it exhibits characteristics under 3001(i). Municipal waste combustor ash must be evaluated for characteristics at the point the ash leaves the resource recovery facility, making the mixing of bottom and fly ash prior to a hazardous waste determination impossible in some cases (SEE ALSO: 10/1/94-02; 59 FR 29372; 6/7/94; 60 FR 6666; 2/3/95).